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You're supposed to call it using the '-i' option like this:
$ tcpdump -i /dev/net/ipro1000/0

When you don't specify anything, it's supposed to take the first interface, and that's obviously not working.
I don't know why it doesn't print an error in this case; I think this might be a bug in tcpdump itself.

Ah, I thought that you wanted to say "without" instead.
The problem I thought you meant is fixed in hrev24441. It didn't print an error because I didn't return one :-)
"tcpdump" works fine here, and I can't reproduce this, if any error remains.